Abstract: In view of the application difficulties of the brand-new aPLI legform, a relevant application research is carried out based on the pedestrian protection development of a vehicle model. Firstly, the parameters of Flex-PLI and aPLI are compared to analyze the characteristics and injury mechanism of aPLI legform. Then, through benchmarking the vehicle models with the same platform, the deviation between simulation and test results of injury is contained within 10%, laying a foundation for the modification and improvement of the vehicle model. Finally, aiming at the problem of the low scoring rate of aPLI legform, three modification schemes are proposed, including adding energy absorbing boxes on auxiliary bumper, adjusting the stiffnesses of the main and auxiliary energy absorbing boxes, and adding the front cross beam on bonnet, to achieve the matching of the stiffnesses of vehicle front-end, resulting in a significant improvement of pedestrian protection performance of the vehicle model.

Key words: aPLI legform, crash safety, pedestrian protection, improvement design